An easier way would be to create a template from an existing song. In case you are unfamiliar with templates just
1) Open your existing song
2) Delete all events in the arranger track (incl. automation, markers, blah blah)
3) Delete (all) files in the pool (not permanently though since they are still needed by the song itself)
4) Save as template.(IMPORTANT!!! do not save the song itself or you'll be very very sorry)
5) Now create a new song and select the template you just created
AFAIK you can not apply a saved template to an already open/created song - which makes kind of sense anyway. You have to create the song based on that particular template in the first place
BTW Studio One 3 can save an instrument with it's FX chain & routing as a preset. Very very cool feature (not sure about send FX though)